Absolute Entropy and Third Law of Thermodynamics
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CHXI06:THERMODYNAMICS

369270 For the reaction, \(\mathrm{2 \mathrm{Cl}(\mathrm{g}) \rightarrow \mathrm{Cl}_{2}(\mathrm{~g})}\), the correct option is:

1 \(\mathrm{\Delta_{\mathrm{r}} \mathrm{H}>0}\) and \(\mathrm{\Delta_{\mathrm{r}} \mathrm{S} < 0}\)
2 \(\mathrm{\Delta_{\mathrm{r}} \mathrm{H} < 0}\) and \(\mathrm{\Delta_{\mathrm{r}} \mathrm{S}>0}\)
3 \(\mathrm{\Delta_{\mathrm{r}} \mathrm{H} < 0}\) and \(\mathrm{\Delta_{\mathrm{r}} \mathrm{S} < 0}\)
4 \(\mathrm{\Delta_{\mathrm{r}} \mathrm{H}>0}\) and \(\mathrm{\Delta_{\mathrm{r}} \mathrm{S}>0}\)
NEET - 2020
CHXI06:THERMODYNAMICS

369271 In which of the following processes entropy increases?
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from 130 K to 0 K .
C.\({\mathrm{2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm{Na}_{2} \mathrm{CO}_{3(\mathrm{~s})}+\mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_{2} \mathrm{O}_{(\mathrm{g})}}}\)
D. \({\mathrm{\mathrm{Cl}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{Cl}_{(\mathrm{g})}}}\)
Choose the correct answer from the options given below:

1 A and C
2 A, B and C
3 A, C and D
4 C and D
NEET - 2024
CHXI06:THERMODYNAMICS

369272 A reaction, \(\mathrm{\mathrm{A}+\mathrm{B} \rightarrow \mathrm{C}+\mathrm{D}+\mathrm{q}}\) is found to have a positive entropy change. The reaction will be

1 Possible at high temperature
2 Possible only at low temperature
3 Not possible at any temperature
4 Possible at any temperature
CHXI06:THERMODYNAMICS

369273 Among the following, the reaction that is accompanied by a decrease in the entropy is

1 \(\mathrm{\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{NH}_{3}(\mathrm{~g})}\)
2 \(\mathrm{\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}(\mathrm{~s})+6 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 6 \mathrm{CO}_{2}(\mathrm{~g})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})}\)
3 \(\mathrm{\mathrm{PCl}_{5}(\mathrm{~s}) \rightarrow \mathrm{PCl}_{3}(\mathrm{l})+\mathrm{Cl}_{2}(\mathrm{~g})}\)
4 \(\mathrm{2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow 2 \mathrm{H}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g})}\)
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CHXI06:THERMODYNAMICS

369270 For the reaction, \(\mathrm{2 \mathrm{Cl}(\mathrm{g}) \rightarrow \mathrm{Cl}_{2}(\mathrm{~g})}\), the correct option is:

1 \(\mathrm{\Delta_{\mathrm{r}} \mathrm{H}>0}\) and \(\mathrm{\Delta_{\mathrm{r}} \mathrm{S} < 0}\)
2 \(\mathrm{\Delta_{\mathrm{r}} \mathrm{H} < 0}\) and \(\mathrm{\Delta_{\mathrm{r}} \mathrm{S}>0}\)
3 \(\mathrm{\Delta_{\mathrm{r}} \mathrm{H} < 0}\) and \(\mathrm{\Delta_{\mathrm{r}} \mathrm{S} < 0}\)
4 \(\mathrm{\Delta_{\mathrm{r}} \mathrm{H}>0}\) and \(\mathrm{\Delta_{\mathrm{r}} \mathrm{S}>0}\)
NEET - 2020
CHXI06:THERMODYNAMICS

369271 In which of the following processes entropy increases?
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from 130 K to 0 K .
C.\({\mathrm{2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm{Na}_{2} \mathrm{CO}_{3(\mathrm{~s})}+\mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_{2} \mathrm{O}_{(\mathrm{g})}}}\)
D. \({\mathrm{\mathrm{Cl}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{Cl}_{(\mathrm{g})}}}\)
Choose the correct answer from the options given below:

1 A and C
2 A, B and C
3 A, C and D
4 C and D
NEET - 2024
CHXI06:THERMODYNAMICS

369272 A reaction, \(\mathrm{\mathrm{A}+\mathrm{B} \rightarrow \mathrm{C}+\mathrm{D}+\mathrm{q}}\) is found to have a positive entropy change. The reaction will be

1 Possible at high temperature
2 Possible only at low temperature
3 Not possible at any temperature
4 Possible at any temperature
CHXI06:THERMODYNAMICS

369273 Among the following, the reaction that is accompanied by a decrease in the entropy is

1 \(\mathrm{\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{NH}_{3}(\mathrm{~g})}\)
2 \(\mathrm{\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}(\mathrm{~s})+6 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 6 \mathrm{CO}_{2}(\mathrm{~g})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})}\)
3 \(\mathrm{\mathrm{PCl}_{5}(\mathrm{~s}) \rightarrow \mathrm{PCl}_{3}(\mathrm{l})+\mathrm{Cl}_{2}(\mathrm{~g})}\)
4 \(\mathrm{2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow 2 \mathrm{H}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g})}\)
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CHXI06:THERMODYNAMICS

369270 For the reaction, \(\mathrm{2 \mathrm{Cl}(\mathrm{g}) \rightarrow \mathrm{Cl}_{2}(\mathrm{~g})}\), the correct option is:

1 \(\mathrm{\Delta_{\mathrm{r}} \mathrm{H}>0}\) and \(\mathrm{\Delta_{\mathrm{r}} \mathrm{S} < 0}\)
2 \(\mathrm{\Delta_{\mathrm{r}} \mathrm{H} < 0}\) and \(\mathrm{\Delta_{\mathrm{r}} \mathrm{S}>0}\)
3 \(\mathrm{\Delta_{\mathrm{r}} \mathrm{H} < 0}\) and \(\mathrm{\Delta_{\mathrm{r}} \mathrm{S} < 0}\)
4 \(\mathrm{\Delta_{\mathrm{r}} \mathrm{H}>0}\) and \(\mathrm{\Delta_{\mathrm{r}} \mathrm{S}>0}\)
NEET - 2020
CHXI06:THERMODYNAMICS

369271 In which of the following processes entropy increases?
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from 130 K to 0 K .
C.\({\mathrm{2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm{Na}_{2} \mathrm{CO}_{3(\mathrm{~s})}+\mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_{2} \mathrm{O}_{(\mathrm{g})}}}\)
D. \({\mathrm{\mathrm{Cl}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{Cl}_{(\mathrm{g})}}}\)
Choose the correct answer from the options given below:

1 A and C
2 A, B and C
3 A, C and D
4 C and D
NEET - 2024
CHXI06:THERMODYNAMICS

369272 A reaction, \(\mathrm{\mathrm{A}+\mathrm{B} \rightarrow \mathrm{C}+\mathrm{D}+\mathrm{q}}\) is found to have a positive entropy change. The reaction will be

1 Possible at high temperature
2 Possible only at low temperature
3 Not possible at any temperature
4 Possible at any temperature
CHXI06:THERMODYNAMICS

369273 Among the following, the reaction that is accompanied by a decrease in the entropy is

1 \(\mathrm{\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{NH}_{3}(\mathrm{~g})}\)
2 \(\mathrm{\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}(\mathrm{~s})+6 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 6 \mathrm{CO}_{2}(\mathrm{~g})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})}\)
3 \(\mathrm{\mathrm{PCl}_{5}(\mathrm{~s}) \rightarrow \mathrm{PCl}_{3}(\mathrm{l})+\mathrm{Cl}_{2}(\mathrm{~g})}\)
4 \(\mathrm{2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow 2 \mathrm{H}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g})}\)
NEET DIGITAL LIBRARY
CHXI06:THERMODYNAMICS

369270 For the reaction, \(\mathrm{2 \mathrm{Cl}(\mathrm{g}) \rightarrow \mathrm{Cl}_{2}(\mathrm{~g})}\), the correct option is:

1 \(\mathrm{\Delta_{\mathrm{r}} \mathrm{H}>0}\) and \(\mathrm{\Delta_{\mathrm{r}} \mathrm{S} < 0}\)
2 \(\mathrm{\Delta_{\mathrm{r}} \mathrm{H} < 0}\) and \(\mathrm{\Delta_{\mathrm{r}} \mathrm{S}>0}\)
3 \(\mathrm{\Delta_{\mathrm{r}} \mathrm{H} < 0}\) and \(\mathrm{\Delta_{\mathrm{r}} \mathrm{S} < 0}\)
4 \(\mathrm{\Delta_{\mathrm{r}} \mathrm{H}>0}\) and \(\mathrm{\Delta_{\mathrm{r}} \mathrm{S}>0}\)
NEET - 2020
CHXI06:THERMODYNAMICS

369271 In which of the following processes entropy increases?
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from 130 K to 0 K .
C.\({\mathrm{2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm{Na}_{2} \mathrm{CO}_{3(\mathrm{~s})}+\mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_{2} \mathrm{O}_{(\mathrm{g})}}}\)
D. \({\mathrm{\mathrm{Cl}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{Cl}_{(\mathrm{g})}}}\)
Choose the correct answer from the options given below:

1 A and C
2 A, B and C
3 A, C and D
4 C and D
NEET - 2024
CHXI06:THERMODYNAMICS

369272 A reaction, \(\mathrm{\mathrm{A}+\mathrm{B} \rightarrow \mathrm{C}+\mathrm{D}+\mathrm{q}}\) is found to have a positive entropy change. The reaction will be

1 Possible at high temperature
2 Possible only at low temperature
3 Not possible at any temperature
4 Possible at any temperature
CHXI06:THERMODYNAMICS

369273 Among the following, the reaction that is accompanied by a decrease in the entropy is

1 \(\mathrm{\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{NH}_{3}(\mathrm{~g})}\)
2 \(\mathrm{\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}(\mathrm{~s})+6 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 6 \mathrm{CO}_{2}(\mathrm{~g})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})}\)
3 \(\mathrm{\mathrm{PCl}_{5}(\mathrm{~s}) \rightarrow \mathrm{PCl}_{3}(\mathrm{l})+\mathrm{Cl}_{2}(\mathrm{~g})}\)
4 \(\mathrm{2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow 2 \mathrm{H}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g})}\)
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